Nanocompósito de acetato de celulose reforçado com whiskers extraídos da macrófita Typha domingensis
César, Natália Reigota
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Composite is a material composed mainly of two phases, the matrix which is continuous and surrounds the other phase, which is called the dispersed phase or stage reinforcement. Nanocomposites are obtained by incorporating reinforcing agent in nanosize in matrices of various origins. The properties of these materials depend on the whiskers, the polymer matrix and the interaction at the interface. Interest in cellulose nanocrystals has grown due to exceptional mechanical characteristics of these materials, the environmental benefits and the low cost. The greatest difficulty in producing them is due to the lack of compatibility with polymer matrices, because the matrices typically exhibit hydrophobic character as opposed to the hydrophilic character of the whiskers, with low interaction in the region of the interface material properties are negatively affected . Among the existing polymer matrix is cellulose acetate polymer which is a cellulose derivative. For the use of whiskers in a matrix of ethyl cellulose, a change in the nanocrystal surface of cellulose using Dianidrido benzofenona tetracarboxílico ou 3,3 ,4,4 (BTDA) was performed. The main objective of this work was to prepare and characterize nanocomposites consisting of cellulose acetate reinforced with whiskers (with and without chemical modification of the surface). It was possible to characterize chemical, thermal and morphologically fibers (young and senescent) of crude and bleached macrophyte Typha domingensis, like whiskers that were extracted from the central parts (young and senescent) of this macrophyte, and it was also possible to characterize acetate films cellulose (mother) and nanocomposites reinforced with whiskers (with and without surface modification). Of all the films prepared, this project allowed select the best property that had mechanics that the nanocomposite was 1.1% - whiskers (senescent) with surface modification and ultrasound, its tensile strength showed an improvement of 66.26% compared to cellulose acetate film.